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Note 16 - Customers (Detail) - Summary of contract revenues generated from the Company's customers: (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Amount (in Dollars) | $ 94,171 |  |  | [1] |  | [1]
% | 15.00% |  |  | [1] |  | [1]
TxDOT [Member] |  |  |  |  |  |
Amount (in Dollars) |  | [1] | 75,818 |  | 95,198 |
% |  | [1] | 15.10% |  | 20.70% |
UDOT [Member] |  |  |  |  |  |
Amount (in Dollars) | $ 100,658 |  | $ 144,398 |  | $ 120,492 |
% | 16.00% |  | 28.80% |  | 26.20% |
[1] | Represents less than 10% of revenues

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration